5 Language Reference

*SRE

*SRE?

This command sets the condition of the Service Request Enable Register. This register determines which bits from the Status Byte Register are allowed to set the Master Status Summary (MSS) bit and the Request for Service (RQS) summary bit. A 1 in any Service Request Enable Register bit position enables the corresponding Status Byte Register bit and all such enabled bits then are logically OR-ed to cause Bit 6 of the Status Byte Register to be set.

When the controller conducts a serial poll in response to SRQ, the RQS bit is cleared, but the MSS bit is not. When *SRE is cleared (by programming it with 0), the power supply cannot generate an SRQ to the controller. The query returns the current state of *SRE.

*STB?

This query reads the Status Byte register, which contains the status summary bits and the Output Queue MAV bit. Reading the Status Byte register does not clear it. The input summary bits are cleared when the appropriate event registers are read. The MAV bit is cleared at power-on, by *CLS' or when there is no more response data available.

A serial poll also returns the value of the Status Byte register, except that bit 6 returns Request for Service (RQS) instead of Master Status Summary (MSS). A serial poll clears RQS, but not MSS. When MSS is set, it indicates that the power supply has one or more reasons for requesting service.

Bit Position

7

6

5

4

3

2

1 − 0

Bit Value

128

64

32

16

8

4

−

Bit Name

OPER

MSS

ESB

MAV

QUES

ERR

−

 

 

(RQS)

 

 

 

 

 

OPER = Operation status summary MSS = Master status summary (RQS) = Request for service

ESB = Event status byte summary

MAV = Message available

QUES = Questionable status summary ERR = Error queue not empty

*WAI

This command instructs the power supply not to process any further commands until all pending operations are completed. Pending operations are as defined under the *OPC command. *WAI can be aborted only by sending the power supply a Device Clear command.

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Series N5700 User’s Guide

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Agilent Technologies 5741A, 5752A, 5744A, 5743A, 5748A manual Sre Sre?, ESB = Event status byte summary MAV = Message available
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